builtin,sync: eliminate calls to _us32_lt in new_map/6, and in the spinloops in Channel.try_push_priv, Channel.try_pop (#25912)

Author: spytheman

vlib/builtin/map.v

@@ -262,7 +262,7 @@ fn map_free_nop(_ voidptr) {
 fn new_map(key_bytes int, value_bytes int, hash_fn MapHashFn, key_eq_fn MapEqFn, clone_fn MapCloneFn, free_fn MapFreeFn) map {
 	metasize := int(sizeof(u32) * (init_capicity + extra_metas_inc))
 	// for now assume anything bigger than a pointer is a string
-	has_string_keys := key_bytes > sizeof(voidptr)
+	has_string_keys := key_bytes > int(sizeof(voidptr))
 	return map{
 		key_bytes:       key_bytes
 		value_bytes:     value_bytes

vlib/sync/channels.c.v

@@ -4,8 +4,8 @@ import time
 import rand
 
 // how often to try to get data without blocking before to wait for semaphore
-const spinloops = 750
-const spinloops_sem = 4000
+const spinloops = u32(750)
+const spinloops_sem = u32(4000)
 
 enum BufferElemStat {
 	unused = 0
@@ -180,7 +180,7 @@ fn (mut ch Channel) try_push_priv(src voidptr, no_block bool) ChanState {
 	if C.atomic_load_u16(&ch.closed) != 0 {
 		return .closed
 	}
-	spinloops_sem_, spinloops_ := if no_block { 1, 1 } else { spinloops, spinloops_sem }
+	spinloops_sem_, spinloops_ := if no_block { u32(1), u32(1) } else { spinloops, spinloops_sem }
 	mut have_swapped := false
 	for {
 		mut got_sem := false
@@ -361,7 +361,7 @@ pub fn (mut ch Channel) try_pop(dest voidptr) ChanState {
 }
 
 fn (mut ch Channel) try_pop_priv(dest voidptr, no_block bool) ChanState {
-	spinloops_sem_, spinloops_ := if no_block { 1, 1 } else { spinloops, spinloops_sem }
+	spinloops_sem_, spinloops_ := if no_block { u32(1), u32(1) } else { spinloops, spinloops_sem }
 	mut have_swapped := false
 	mut write_in_progress := false
 	for {